power steering help

[jas_stang]

have a hard time turning at slow speeds like trying to park. noticed that if i touch the brakes while turning the steering wheel will lock up, can't hardly turn it, but if i let off the brake, i can turn it but it is still hard to turn. does that sound like a pump problem, or a gear box problem. i do have some float to the steering but the truck only has 256000 miles also, the pressure line from the hydroboost to the gearbox has developed a pretty good leak on the fitting at the gearbox, does anyone know the size of the o-ring, i think it is 5/16 inside diameter, but i would like to know for sure what size so i can replace it. thanks for any suggestions.

[tweener]

Sounds like a PUMP.....I have been searching on this forum about P/S problems, to see what the deal is, cause mine moans all the time, worse when turning or stepping on the brake...and looses some asist when doing both. I have looked at about 10 threads related to P/S and the general conclucion is that the pumps tend to go out.... Also have read that some people use mercon V or Mobil 1 synthetic ATF in the P/S system to help out....one guy eliminated his moan by changing out his fluid to the synthetic.

[killbill]

I'd have to agree with tweener. My 96 is in the same boat. But my pump is completely gone. It blew up on Mamorial Day weekend. I am just strong arming it until I can afford to replace it.